Commit graph

29 commits

Author SHA1 Message Date
Arnaldo Carvalho de Melo
a4bf390242 [DCCP] minisock: Rename struct dccp_options to struct dccp_minisock
This will later be included in struct dccp_request_sock so that we can
have per connection feature negotiation state while in the 3way
handshake, when we clone the DCCP_ROLE_LISTEN socket (in
dccp_create_openreq_child) we'll just copy this state from
dreq_minisock to dccps_minisock.

Also the feature negotiation and option parsing code will mostly touch
dccps_minisock, which will simplify some stuff.

Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 22:50:58 -08:00
Arnaldo Carvalho de Melo
c25a18ba34 [DCCP]: Uninline some functions
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 21:58:56 -08:00
Arnaldo Carvalho de Melo
017487d7d1 [DCCP]: Generalize dccp_v4_send_reset
Renaming it to dccp_send_reset and moving it from the ipv4 specific
code to the core dccp code.

This fixes some bugs in IPV6 where timers would send v4 resets, etc.

Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 19:25:24 -08:00
Arnaldo Carvalho de Melo
91f0ebf7b6 [DCCP] CCID: Improve CCID infrastructure
1. No need for ->ccid_init nor ->ccid_exit, this is what module_{init,exit}
   does and anynways neither ccid2 nor ccid3 were using it.

2. Rename struct ccid to struct ccid_operations and introduce struct ccid
   with a pointer to ccid_operations and rigth after it the rx or tx
   private state.

3. Remove the pointer to the state of the half connections from struct
   dccp_sock, now its derived thru ccid_priv() from the ccid pointer.

Now we also can implement the setsockopt for changing the CCID easily as
no ccid init routines can affect struct dccp_sock in any way that prevents
other CCIDs from working if a CCID switch operation is asked by apps.

Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 19:21:44 -08:00
Andrea Bittau
afe00251dd [DCCP]: Initial feature negotiation implementation
Still needs more work, but boots and doesn't crashes, even
does some negotiation!

18:38:52.174934  127.0.0.1.43458 > 127.0.0.1.5001: request <change_l ack_ratio 2, change_r ccid 2, change_l ccid 2>
18:38:52.218526  127.0.0.1.5001 > 127.0.0.1.43458: response <nop, nop, change_l ack_ratio 2, confirm_r ccid 2 2, confirm_l ccid 2 2, confirm_r ack_ratio 2>
18:38:52.185398  127.0.0.1.43458 > 127.0.0.1.5001: <nop, confirm_r ack_ratio 2, ack_vector0 0x00, elapsed_time 212>

:-)

Signed-off-by: Andrea Bittau <a.bittau@cs.ucl.ac.uk>
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 17:43:56 -08:00
Andrea Bittau
e84a9f5e9c [DCCP]: Notify CCID only after ACK vectors have been processed.
The CCID should be notified of packet reception only when a packet is
valid.  Therefore, the ACK vector needs to be processed before
notifying the CCID.  Also, the CCID might need information provided by
the ACK vector.

Signed-off-by: Andrea Bittau <a.bittau@cs.ucl.ac.uk>
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-01-03 14:26:15 -08:00
Andrea Bittau
9e377202d2 [DCCP]: Send an ACK vector when ACKing a response packet
If ACK vectors are used, each packet with an ACK should contain an ACK
vector.  The only exception currently is response packets.  It
probably is not a good idea to store ACK vector state before the
connection is completed (to help protect from syn floods).

Signed-off-by: Andrea Bittau <a.bittau@cs.ucl.ac.uk>
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-01-03 14:25:49 -08:00
Andrea Bittau
709dd3aaf5 [DCCP]: Do not process a packet twice when it's not in state DCCP_OPEN.
When packets are received, the connection is either in DCCP_OPEN
[fast-path] or it isn't.  If it's not [e.g. DCCP_PARTOPEN] upper
layers will perform sanity checks and parse options.  If it is in
DCCP_OPEN, dccp_rcv_established() will do it.  It is important not to
re-parse options in dccp_rcv_established() when it is not called from
the fast-path.  Else, fore example, the ack vector will be added twice
and the CCID will see the packet twice.

The solution is to always enfore sanity checks from the upper layers.
When packets arrive in the fast-path, sanity checks will be performed
before calling dccp_rcv_established().

Note(acme): I rewrote the patch to achieve the same result but keeping
dccp_rcv_established with the previous semantics and having it split
into __dccp_rcv_established, that doesn't does do any sanity check,
code in state != DCCP_OPEN use this lighter version as they already do
the sanity checks.

Signed-off-by: Andrea Bittau <a.bittau@cs.ucl.ac.uk>
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-01-03 14:25:17 -08:00
Arnaldo Carvalho de Melo
d83d8461f9 [IP_SOCKGLUE]: Remove most of the tcp specific calls
As DCCP needs to be called in the same spots.

Now we have a member in inet_sock (is_icsk), set at sock creation time from
struct inet_protosw->flags (if INET_PROTOSW_ICSK is set, like for TCP and
DCCP) to see if a struct sock instance is a inet_connection_sock for places
like the ones in ip_sockglue.c (v4 and v6) where we previously were looking if
sk_type was SOCK_STREAM, that is insufficient because we now use the same code
for DCCP, that has sk_type SOCK_DCCP.

Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-01-03 13:10:58 -08:00
Arnaldo Carvalho de Melo
f21e68caa0 [DCCP]: Prepare the AF agnostic core for the introduction of DCCPv6
Basically exports a similar set of functions as the one exported by
the non-AF specific TCP code.

In the process moved some non-AF specific code from dccp_v4_connect to
dccp_connect_init and moved the checksum verification from
dccp_invalid_packet to dccp_v4_rcv, so as to use it in dccp_v6_rcv
too.

Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-01-03 13:10:50 -08:00
Arnaldo Carvalho de Melo
57cca05af1 [DCCP]: Introduce dccp_ipv4_af_ops
And make the core DCCP code AF agnostic, just like TCP, now its time
to work on net/dccp/ipv6.c, we are close to the end!

Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-01-03 13:10:40 -08:00
Arnaldo Carvalho de Melo
2a9bc9bb4d [DCCP]: Transition from PARTOPEN to OPEN when receiving DATA packets
Noticed by Andrea Bittau, that provided a patch that was modified to
not transition from RESPOND to OPEN when receiving DATA packets.

Signed-off-by: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-10-10 21:25:00 -07:00
Arnaldo Carvalho de Melo
ae31c3399d [DCCP]: Move the ack vector code to net/dccp/ackvec.[ch]
Isolating it, that will be used when we introduce a CCID2 (TCP-Like)
implementation.

Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-09-18 00:17:51 -07:00
Arnaldo Carvalho de Melo
0c10c5d968 [DCCP]: More precisely set reset_code when sending RESET packets
Moving the setting of DCCP_SKB_CB(skb)->dccpd_reset_code to the places
where events happen that trigger sending a RESET packet.

Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-09-16 16:58:33 -07:00
Arnaldo Carvalho de Melo
2b80230a7f [DCCP]: Handle SYNC packets in dccp_rcv_state_process
Eliciting a SYNCACK in response, we were handling SYNC packets
only in the DCCP_OPEN state, in dccp_rcv_established.

Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
2005-09-13 19:05:08 -03:00
Arnaldo Carvalho de Melo
811265b8e8 [DCCP]: Check if already in the CLOSING state in dccp_rcv_closereq
It is possible to receive more than one CLOSEREQ packet if the
CLOSE packet sent in response is somehow lost, change the state
to DCCP_CLOSING only on the first CLOSEREQ packet received.

Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
2005-09-13 19:03:15 -03:00
Arnaldo Carvalho de Melo
b0e567806d [DCCP] Introduce dccp_timestamp
To start the timestamps with 0.0ms, easing the integer maths in the CCIDs, this
probably will be reworked to use the to be introduced struct timeval_offset
infrastructure out of skb_get_timestamp, etc.

Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
2005-09-09 02:38:35 -03:00
Arnaldo Carvalho de Melo
331968bd0c [DCCP]: Initial dccp_poll implementation
Tested with a patched netcat, no horror stories so far 8)

Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-08-29 16:05:45 -07:00
Arnaldo Carvalho de Melo
7ad07e7cf3 [DCCP]: Implement the CLOSING timer
So that we retransmit CLOSE/CLOSEREQ packets till they elicit an
answer or we hit a timeout.

Most of the machinery uses TCP approaches, this code has to be
polished & audited, but this is better than we had before.

Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-08-29 16:04:31 -07:00
David S. Miller
58e45131dc [DCCP]: Fix printf format warnings on 64-bit.
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-08-29 16:04:27 -07:00
Arnaldo Carvalho de Melo
03ace394ac [DCCP]: Fix the ACK and SEQ window variables settings
This is from a first audit, more eyeballs are more than welcome.

Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-08-29 16:03:42 -07:00
Arnaldo Carvalho de Melo
a3054d48b9 [DCCP]: Give more info on Step 6 failure debug printk
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-08-29 16:03:33 -07:00
Arnaldo Carvalho de Melo
c59eab4637 [DCCP]: Use LIMIT_NETDEBUG in some debugging printks
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-08-29 16:02:26 -07:00
Arnaldo Carvalho de Melo
e92ae93a8a [DCCP]: Send SYNCACK packets in response to SYNC packets
Also fix step 6 when receiving SYNC or SYNCACK packets, i.e. we were not using
the updated swl.

Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-08-29 16:01:50 -07:00
Arnaldo Carvalho de Melo
8649b0d416 [DCCP]: Fix RESET handling in dccp_rcv_state_process
To avoid holding TIMEWAIT state for sockets in the LISTEN state.

Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-08-29 15:59:50 -07:00
Arnaldo Carvalho de Melo
7690af3fff [DCCP]: Just reflow the source code to fit in 80 columns
Andrew Morton should be happy now 8)

Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-08-29 15:59:26 -07:00
Patrick McHardy
64ce207306 [NET]: Make NETDEBUG pure printk wrappers
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-08-29 15:56:08 -07:00
David S. Miller
f6ccf55419 [DCCP]: Fix u64 printf format warnings.
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-08-29 15:54:34 -07:00
Arnaldo Carvalho de Melo
7c657876b6 [DCCP]: Initial implementation
Development to this point was done on a subversion repository at:

http://oops.ghostprotocols.net:81/cgi-bin/viewcvs.cgi/dccp-2.6/

This repository will be kept at this site for the foreseable future,
so that interested parties can see the history of this code,
attributions, etc.

If I ever decide to take this offline I'll provide the full history at
some other suitable place.

Signed-off-by: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-08-29 15:49:46 -07:00